I think the concept is brilliant but in my own opinion you are not highlighting the real value proposition which I believe is:

Post your ad to several advertising network from a single place. (Although you seem to be supporting only Google at the moment)

I would suggest the "free templates" is positioned as an added advantage and not the main value.

Other people have touched on the little visual errors. So I wont repeat that.

Good luck man! and may the dollars roll in.